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You can flash the phone
/t5/Xperia-Z2/How-to-manually-update-downgrade-root-2014-Xperias/td-p/593459
but you can't change the bands.
2G are the same on both
GSM 850 / 900 / 1800 / 1900
3G
850 / 900 / 1700 / 1900 / 2100 - D5803
850 / 900 / 1900 / 2100 - D5833
4G
1(2100), 2(1900), 3(1800), 4(1700/2100), 5(850), 7(2600), 8(900), 13(700), 17(700), 20(800) - D5803
1(2100), 3(1800), 5(850), 7(2600), 8(900), 28(700), 40(2300) - D5833
As long as the carrier/network in Norway is compatible with the D5833 variant, it should work